A.must be displayed when day signals are being used
B.must be displayed when moored to a pier
C.may be extinguished at night on open waters when no other vessels are in the area
D.may be displayed during daylight
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A.green lights
B.red lights
C.yellow lights
D.white lights
A.mile board
B.dredging mark
C.passing daymark
D.crossing daymark
A.drilling
B.soil reactions
C.temperature
D.current
A.the starboard side of the channel
B.the centerline of the channel
C.an obstruction where the preferred channel is to starboard
D.special purpose areas
A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward
最新試題
During the day，a vessel with a tow over 200 meters in length will show（）.
At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.
All fog signals shall be sounded every two minutes with the exception of a vessel（）.
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.
A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.
A power-driven vessel underway shall keep out of the way of（）.
A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.
Daymarks marking the starboard side of the channel when going towards the sea are（）.
A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）